Un guide critique: Ensemble de filtre fin à carburant FAW pour tracteur CA4251P66K24T1A3E5

Welcome to this critical guide on the Filtre fin à carburant FAW (Partie no. 1117010-81D), the most important line of defense for the high-pressure fuel injection system on the FAW Jiefang CA4251P66K24T1A3E5 6×4 tracteur semi-remorque diesel.

This component is not just a simple screen; the modern Filtre fin à carburant FAW is an advanced multi-stage coalescing and filtration unit. Its sole purpose is to remove microscopic abrasive particles and, le plus important, all traces of water from the diesel fuel before it reaches the multi-thousand-PSI common rail pump and injectors.

Ce guide est une ressource essentielle pour les techniciens professionnels, fleet maintenance managers, et spécialistes des pièces détachées. Nous déconstruirons l'ensemble Filtre fin à carburant FAW assemblée, including its permanent mounting base, its replaceable cartridge, and its rigid support bracket, down to the last serviceable nut and bolt.

Core System: The Base (7020) and Element (7050)

The parts list for Mark 1 details the three key components of the Filtre fin à carburant FAW système. The parent part is the ‘Fuel Fine Filter Assembly’ (1117010-81D), which is the complete unit. This assembly is comprised of two distinct serviceable parts:

**1. The ‘Fuel Fine Filter Base Assembly’ (1117020-81D):** This is the permanent, non-replaceable “head” du système. It is a precision-cast aluminum housing that bolts to the main bracket. This base contains the fuel inlet and outlet ports, the threaded mount for the filter element, and likely the ports for a fuel pre-heater and a “Water-in-Fuel” (WiF) capteur. This base is the control hub for the entire Filtre fin à carburant FAW.

**2. The ‘Fuel Fine Filter Element Assembly’ (1117050-81D):** C'est le “service part” or the cartridge. This is the replaceable, spin-on canister that contains the actual filter media. During a service, this element is the only part of the Filtre fin à carburant FAW (1117010-81D) that is discarded and replaced. Its design is crucial for protecting the engine.

Understanding this relationship is key: the Base (7020) and the Element (7050) combine to create the complete ‘Fuel Fine Filter Assembly’ (7010). A technician services the element, but the base remains fixed to the truck. This modularity is a core part of the Filtre fin à carburant FAW conception.

Pourquoi “Fine” Filtration is Critical for HPCR Engines

The name “Fuel Fine Filter” is not a marketing term; it is a critical engineering specification. Ce Filtre fin à carburant FAW is the final, and most important, stage of filtration before the fuel enters the High-Pressure Common Rail (HPCR) injection system. This system’s components, particularly the injectors, are built to tolerances of less than 3-5 microns (a human hair is about 70 microns).

**1. Abrasive Particle Removal:** The primary job of the Filtre fin à carburant FAW media is to trap microscopic hard particles. This includes silica (fine dirt) that may get past the primary filter, and rust or metal flakes from fuel tanks and stations. If even one of these particles reaches the injector, it acts like a sandblaster, eroding the injector’s delicate pintle and nozzle seat. This erosion causes the injector to leak, resulting in poor fuel atomization, black smoke, high fuel consumption, and eventual engine failure.

**2. Water Coalescing (Separation):** The secondary, and equally critical, fonction du Filtre fin à carburant FAW is water separation. Diesel fuel naturally absorbs and carries water. This water is catastrophic for an HPCR system. D'abord, it causes rust and corrosion on the precision-machined internal surfaces of the pump and injectors. Deuxième, when water (which is incompressible) is subjected to 30,000+ psi, it can instantly blow the tip off an injector. The advanced media in the Filtre fin à carburant FAW est “hydrophobic.” It repels water, forcing the tiny emulsified water droplets to “se fondre” (merge) en plus grand, gouttelettes plus lourdes, which then fall out of the fuel flow and are collected in a bowl at the bottom of the filter assembly, where they can be drained.

Using a non-genuine filter element can destroy this engine. A cheap filter that cannot meet the “fine” micron rating or cannot properly coalesce water will allow these contaminants to pass, leading to thousands of dollars in repairs to the fuel injection system. L'ensemble Filtre fin à carburant FAW assemblée (1117010-81D) is the gatekeeper that protects the engine’s most expensive components. This makes the Filtre fin à carburant FAW one of the most important serviceable parts on the entire truck.

Structural Mount: L'assemblage du support (1117120-81D)

The ‘Fuel Fine Filter Bracket Assembly’ (1117120-81D) is the structural foundation for the entire system. This is a heavy-duty, stamped steel bracket designed to be bolted directly to the truck’s main chassis frame rail.

Its function is two-fold. D'abord, it provides a stable, rigid mounting location for the ‘Fuel Fine Filter Base Assembly’ (1117020-81D). This is crucial for preventing the heavy, fuel-filled filter assembly from vibrating. Deuxième, it isolates the Filtre fin à carburant FAW system from the high-frequency vibrations of the engine. By mounting the filter on the “sprung” chassis instead of the “unsprung” moteur, the fuel lines and fittings are subjected to far less stress, preventing fatigue, fissure, and dangerous high-pressure fuel leaks.

Fastener System Breakdown (Marques 3, 4, 5, 6)

The parts list details a specific set of high-tensile fasteners to secure the Filtre fin à carburant FAW système. This hardware is not optional; it is engineered for this specific application.

**Bracket-to-Chassis Fasteners:** The ‘Hex flange bolts’ (Q1841075 and Q1841020), with two of each, are the main bolts that secure the ‘Bracket Assembly’ (1117120-81D) to the truck’s frame rail. The different part numbers indicate different lengths, required for the specific geometry of the chassis mount. The flange head is critical for spreading the load and resisting loosening from road vibration.

**Base-to-Bracket Fasteners:** The two ‘Hex flange bolts’ (Q1841030) and two ‘Hex nuts’ (CQ34010) are the hardware used to secure the ‘Fuel Fine Filter Base Assembly’ (1117020-81D) *to* the ‘Bracket Assembly’. This bolt-and-nut combination allows the base to be securely “sandwiched” onto the bracket, creating the final, rigid Filtre fin à carburant FAW assemblée.

FAW Fuel Fine Filter Parts List

Le tableau suivant fournit l'intégralité, detailed breakdown of all components identified in the ‘Fuel Fine Filter’ schéma du tracteur FAW CA4251P66K24T1A3E5. Servicing the Filtre fin à carburant FAW (1117050-81D) is a critical maintenance task.

Spécifications techniques et contexte d'assemblage

Les spécifications pour le Filtre fin à carburant FAW are defined by its function as the final protection for the High-Pressure Common Rail (HPCR) injection system. L'ensemble Filtre fin à carburant FAW assembly is a critical component.